Oscillating rotary shear



Y Nov. 5, 1946.,n R. H. STEVENS- OSCILLATING ROTARY SHEAR Filed June 22.Y 1945 6 Sheets-Sheet 1 m'dSleI/ags:

Nov. 5, 1946. R. H. STEVENS OSCILLATING ROTARY SHEAR `Filed June 22,1945 6 Sheets-Sheet 2 R. H. STEVEN-S Filed June 22, 1945 e sheets-smet sNov. 5, 1946.

OSCILLATING ROTARY SHEA n Nov. 5, 1946. R. H. STEVENS 2,410,555

OSCILLATING ROTARY SHEAR Filed Jun 22. 1945 6 vSheets-Shedl 4 NGV. 5,1946. R, H, STEVENS 2,410,555

OSCILLATING ROTARY SHEAR Filed June 22, 1945 6 Sheets-Sheet 5 ,2f/ r if162 1 5; Sivens..

F'iledl June 22, 1945 6 Sheets-Sheet 6 MdR/Sen;

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Patented Nov.

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OSCILLATING ROTARY SHEAR Richard H. Stevens, Baltimore, Md., assignor toBethlehem Steel Company, a corporation of Pennsylvania Application June22, 1945, Serial No. G01-.012

24 Clas. (El. 164-68) This invention pertains to metal shearingapparafus, and more particularly to a rotary shear for cutting metalsheets, strips, bars and the like into sections of predetermined lengthwhile the stock is in'motion.

On the present rotary shears there is only one length of cut at whichthe peripheral speed of the knives corresponds. to the speed of thestrip.

This speed is usually for the maximum length of cut. On all shorter cutsthe shear is sp'eeded up, and consequently at the/time of cut there is a'jerk on the strip or like material. For instance, if the strip istraveling 1600 feet lper minute and the drum carrying the bottom knifeis 42 inches in diameter and substantiallyll feet in circumference, atsynchronous speed the drum carrying the shear blade would be makingapproximately l600+11=145.5 R. P. M., and make 48.5 33-foot cuts perminute. Now if the cut is 16.5 feet, the number of cuts perminute=1600z16.5=97 cuts per minute which corresponds to 97 3=291 R. P.M. of drum or twice as fast A as for a 33- foot cut.

While there is an overrunning clutch between the Waterbury drive and theshear, the inertia of the shear at this highl speed is enough to stretchthe hot strip during the time of cutting and reducing the gage in therolls which makes a very definitive mark on each plate sheared.'

If, however, the whole shear is advanced or retarded at the differentialspeed between the speed of the strip and the peripheral speed of thedrum, the cutting will always be done at a synchronous speed thuseliminating the jerk while cutting.

One of the objects of my invention is to provide.

a rotary shear with means for varying the speed of the shears withrespect to the speed of the stock so that variations may be made in boththe lengths of the cuts and the speed of. operation of the machine.

. Another object of my invention is to provide a rotating shear in whichthe cutting blades, in addition to being rotated transversely of thestock for effecting the cuts, are also positively osclllated in thedirection of the line of travel of the stock, to cause the cuttingblades to move with the stock when the cut is made, and in whichmatically controlled mes are provided whereby to increase thevariationsin lengths of cuts permissible in the machine as well asincrease the4 variations in the limits of its operation.

These and various other objects, as well as the various other novelfeatures and advantages of the invention, will be apparent when thefollowthe mechanism employed for producing such' oscillations isdesigned to be adjusted in such a way that the linear speed of theblades may be synchronized with that of the stock at the instantoicutting.

It is also an object of the invention to provide a rotary shear in whichmanually as wellv as autosupported on swinging arms.

ing detailed description is read in conjunction with the accompanyingsix sheets of drawings in which like characters of reference indicatelike parts.

Figure 1 is a plan view showing diagrammatically one form of Yanoscillating rotary shear constructed` in accordance with my invention inwhich a well known Waterbury control is used.

Fig. 2 is a vertical section of the rocker arm taken on the line 2--2 ofFig, i Fig. 3 is a vertical longitudinal 'section taken on the line 3 3of Fig. 1 and indicating the approximate relative position of themechanism at the completion of the cut.

Fig. 4 is a vertical section of the oscillating arm taken on the lineSiof Fig. 3.

Fig. 5 is a modiiication showing an oscillating rotary shear having adouble head shear,

Fig. 6 is a transverse section of the rocker arm shown in Fig. 5 takenon the line 6 6 of Fig. 5.

Fig. 'I is a transverse section of the rocker arm taken on the line I-'lof Fig. 5. Y

Fig. 8 illustrates diagrammatically a synchronized cutting rotary shearwith a cutting range from 72", to 156" length cuts.

Fig. 9 is a modification in which the crank arm Fig. 11 shows anothermodification in which the speed change gear is mounted directly on theoscillating sheary framel and driven by the shear drive.

Fig. 12 is a top plan view of the detail shown in Fig. 11. l

Fig. 13 shows another modication in which the oscillating rotary shearsare mounted and Fig. 14 is a front elevation of the detail shown in Fig.13.

Referring now to thevarious characters of reference on the drawings andrst to Figs..l to 4, the numeral I 'indicates the 'base for the shearframe having a slideway 2r adapted to receive and support theoscillating shear frame 3 in which the top and bottom rotary shear drums4 and 5 respectively are mounted and geared together as at 6. The rotaryshear drums are connected by means of a vibrating spindle 1 to a shaft 8having a gear 9 mounted thereon meshing with pinions I and Il on motorshafts |2 and I3 ot the driving motors |4 and I5.

In some of the control systems now in use the rotary shears are mountedin a stationary housing and interconnected with the finishing roll standfrom which strip or the like is delivered to the shear so that therelative speeds bear a fixed relation to one another. Provision is madefor adjusting this relation so as to .correspondingly adjust the lengthof the cut. This ls accomplished by means of a uid pump and ahydraulically connected fluid motor of the well-known Waterbury type.

In this form of my invention therctating speed is manipulated forshearing varying lengths of strip by a Waterbury hydraulic control andthe lever connections for the oscillating movement Waterbury control. Toaccomplish this the shaft 8 is connected by means of an overrunningclutch i6 to the hydraulic motor I1 which is connected by fluidconductors I8 to a hydraulic pump i9 having a shaft 28 provided with agear 2| meshing with a gear 22 on shaft 23 extending to the finishingrolls 24 and driven by a motor 25. The hydraulic motor I1 and the pumpI9 are of the well-known Waterbury type and run always in a definitespeed relationship to one another.

This will be more clearly understood by referring to the Iverson PatentNo. 2,085,981, but as this type of control is well. known in this art adetailed description of the same is not believed necessary.

In order to control the oscillating movement of the rotating shears theshaft 8 has a spur gear 26 mounted thereon meshing 'with a similar gear21 on a stub shaft 28 provided at its outer end with a bevel gear 29meshing with a bevel gear 30 mounted on one end of a shaft 3|, having atits opposite end a bevel gear 32 meshing with a bevel gear 33 on one endof shaft 34 provided at -its opposite end portion with a spur gear 35which -meshes with a, gear 36 on crank shaft 31 provided 'of shear isarranged to match the speed set by the The threaded shaft ss has a nutsa thereon with a cylindrical extension 64 to which the opposite end ofthe rod 53 to that connected to the rocker arm 42 is pivoted and isfurther provided with oppositely disposed trunnions 65 for pivoting theends of a pair of pltman rods 86 thereto. 'I'he opposite ends of saidpitman rods being pivoted to the shear frame 3 as at 61.

In this arrangement the motors 49 and 62 are synchronized with thesetting motor for the Waterbury drive and the strip 68 is advanced fromthe finishing rolls 24 in the direction of the arrow as indicated inFig. 3 between the shear drums 4 and 5 and after the shearing operationbetween pinch rolls 69 to a receiving table 18.

When the idea is applied to other rotary shears where the speed is setby hand before starting to out the levers for giving the oscillatingmovement of the rotary shears will be set by hand also thus simplifyingthe lever arrangement. On this type of shear there is a. speed changegear which is set by hand for the particular length cut required, andthe location of the connecting rod and crank arm are set by hand to thesame mark thus giving the proper oscillation of .the shears for thatout.

Referring now to Figs. 5 to l2, inclusive, Fig. 5 shows a double headshear for increased range without increasing the rotary speed, thecutting lengths being as indicated from 14" to 40". With this deviceboth shear heads are used for cutting lengths of strip from 14" to 20"and the adjustable head on the left is omitted when `cutting lengths 20"to 40".

If two heads are cutting then the adjustable head is also set at halfthat distance thus in,- creasing the range of cutting, as indicated inthis particular case, from 14" to 40".

mounted thereon.

A motor 49 is mounted on the lower end of the I rocker arm 42 having itsshaft provided with a bevel gear 58 meshing with the bevel gear 41 forrotating the threaded shaft 44 through the pinions 45 and 46. 'Ihethreaded shaft 44 is further `provided with a nut 5| having acylindrical ex- 80 of the oscillating arm 54 and rotated by means of labevel gear 6I on the shaft of a motor 62.

The shear frames 13 and 14 are connected together at their bases bymeans of a rod 19 which is threaded at one end as. at to engage a nut 8|secured toy the lower surface of the shear frame 13. The rod 19 isprovided with a ange 82 and a nut 83 by means of which the rod isclamped in iixed relation to the shear frame 14, and said rod 19 isfurther provided with a squared end 84 for receiving a wrench or thelike for rotating the same for adjusting the shear frame 18, in relationto the shear frame 14. As shown in full lines in this figure the shearframes 13 and 14 are indicated in the position they assume in cutting14" lengths. When it is desired to cut 20" lengths the shear frame 13 isadjusted by rotating the rod 19 to the position shown in dotted lines,orif it is desired to cut a length between 14" and 20" the shear frame 13may be adjusted between these two positions.v If it is desired-to cutllengths between 20" and 40" the shear frame 13 is removed and theadjustment is made on the rocker arm.

For oscillating the shear frames 13 and 14 the shear frame 14 isprovided with a downwardly extending ange 85 to which one end of vtherod 86 is pivoted as at 81, the opposite end of said rod being pivotedto a studV shaft extension 88 of a nut 89 on a threaded shaft 90journaled in a rocker arm 9|, pivotally mounted as at 92 for swingingmovement. The rocker arm 9| has a projecting ear 93 adjacent to itsupper end adapted for pivoting as at 94 to one end of aasattoacrankarmsl for supporting and advancing the of strip ranging from'72" or 57",*1'11 circumference or 18.15

there will be of which is pivoted having a shaft 98. 'This crank arm 91is. connected with and is adapted tov be driven at the same speed as theshear drums.

The threaded shaft 90 is provided `with a squared end 98 for receiving awrench or the like for rotating the same to adjust the nut 89 and theconnecting rod 88.

When two shear frames are used as indicated, the knives on the sheardrums of shear frame at the right are disposed 5 the shear drums on theshear frame at the left so that each set of knives are cutting while thespeed of the strip is under control of the roller leveler |0| precedingthe shear. Pairs of pinch rolls |02 and |03 are located adjacent t0opposite sides of the shear head l0 operating at strip speed Y cutlengths of strip to the conveyor mit and thence to a piler.

Fig. 8 illustrates diagrammatically a synchronous cutting rotary shearfor cutting lengths to 156" in which the shear always cuts when theshear knives and strip are in synchronism. In this diagram indicates theshear frame for the shear drums H00 and |01. A connecting rod |08 ispivoted at one end to the shear frame i 05 and its opposite endis'adjustably' pivoted to a rocker arm |09 in the manner indicated inFig. 5. |09 is also connected in a similar manner as indicated in thisgure to a rotating crank arm H0 by means of a pitman e i.

As an example for this diagram, assuming a normal strip speed of 600' or7200" per minute and a range of cuts from 72" to 156" being desired, themean cut at synchronous speed will then be J' 5 pitman 95, the oppositeend 07 per cut, this drum will be and the top shear drum |06 will be or12.1" in diameter. For the shortest length of cut 72", there will thenbe l or 100 outs per minute, at speed of 200 R, P. M. For

the longest cut 156",

or 46.15 cuts per minute, at the maximum drum speed of 92.30 R. P. M.At'mean cut 114, there will be or 63.15 cuts per minute, the mean rotarysynchronous speed of the drum'being 126.30 R. P. M.

At 100 cuts per minute the peripheral speed of the drum i0? will be11,400" per minute, and the differential forward speed will be11,400"7200" or +4200". v

'I'he rocker arm q 'in diameter,

ahead of the knivesy on the maximum drum driven by a gear lin which H2indicates the base or the like is applied to revolves at the rate perTout, then at 100 cuts per minute the travel of the crank at eachrevolutionwill be or 42", circumference or 13.4, diameter, giving 6.7",as the radius or length of the crank.

AtA 46.15 cuts per, minute, the crank travel will e in which the crankand speed change gear are located adjacent to the shear frame with a rodconnecting the crank arm withy the shear frame, having a slideWay H3 forthe -shear frame or head ||4 ing the shear as at Hl.

The shaft for the lower shear drum ||6 at one end extends outwardly asat 8 and is coupled I9, the opposite bearings 30 Iextending from a disk|36 mounted on the crank shaft |3| which is journaled in a A xedpedestal support |37 and provided with a scale thereon ranging from wormwheel has a as set/'for 75" cuts. lengths ranging from 75" 630 is movedto the desired length cut indicated on the scale.

The worm wheel E32 is driven from the shear drive and aty the same speedand is mounted gn the -crank drive and changes the relative posiion 0ithe correct speed. n

In Figs. 11 and 12 I have shown another modication in which the worm ismounted on a gear on the lower drum shaft and adapted to oscillate withthe shear frame or head of the shear the end shear drum extends.

drums H5 and H6 geared together |22 keyed outwardly as at mi and hasmeer 14s-keyed |50 of the ,A

gear |50 has a pair of extending bearings |53 formed integral therewithin which is iournaled the shaft |54 of a worm |55 meshing with a wormwheel |55 mounted on the shalt |5| and keyed to a crank arm. |51. 'Ihecrank arm |51 'is pivoted as at |58 to one end of a connecting rod |59,said rod having its opposite end pivoted as at |6|| to an anchor bracketThe worm gear vis providedwith a pointer |52. The relation of the crankarm |51 to the shear knives as shown in Fig. 11 is for making 15G" cuts.By applying e. wrench to the extending squared end |53 of the worm shaft|54 the position can be shifted with the worm |55 to intermediatepointsasindicated for cuts desired.

In Figs. 13 and 14, I have illustrated an oscillating rotary shearhaving the shafts of the rotating drums journaled in swinging armsinstead of a reciprocating shear frame in which |54 indicates the baseframe provided with bearings |65 for a drive shaft |66 which extendsthrough the lower ends of spaced swinging side arms |61 and Hit-having agear |59 mounted thereon for rotating the top and bottom shear drums |10and |1| through the gear |12 and |13, respectively. The pivoted swingingside arms |51 and |58 are provided centrally with ears |14 and |15 towhich the ends of a pair of rods |15 and |11 are pivoted as at |18. Theconnecting rods are adapted to extend to controlling means and assumingthe strip speed is 600 feet per minute and the cutting range 12" to 156"the description of Fig. 8 would apply' in a similar manner to thismodication.

Although I have shown `and described my invention in considerabledetail, I do not wish to be limited to the exact construction shown anddescribed, i`put mayuse such substitutions, modincations or equivalentsthereof, as are embraced within the scope or my invention, or as pointedout in the claims.

Having thus described'my invention, what I claim as new and desiretosecure by Letters Patent is:

1. In a rotary shear adapted to cut moving strip material into lengths,a pair o! cooperating shear drums mounted for reciprocation with thestrip material eachhaving a cutting'blade there,- on, means for rotatingthe shear drums. a rotanr crank arm, a connection .between the rotatingcrank arm and the shear drums, and means for adjusting the connectionfor varying the speed of the reciprocating and rotating shear drums forvarious length cuts.

2.- In a rotary shear adapted to cut moving strip material into lengths,a pair of cooperating shear drums mounted for reciprocation with thestrip material each having a cutting blade thereon, means for rotatingthe shear drums, a crank arm mounted adjacent to the shear drums, meansfor rotating the crank arm, a connection between the rotating 'crank armand the drive for the rotating shear drums, a pivoted arm in theconnection betweenl the rotating crank arm and the means for rotatingthe shear drums, and adjusting means on the pivoted arm for varying thereciprocating speed of the rotating shear drums for various length cuts.

a In a rotary shear adapted for cutting conper and lower cooperatingshear drums mounted for reciprocation with the -strlp material each Yhaving a cutting blade thereon,` means for rotating the shear drums, yarotatlngcrank arm.`

means for continuously rotating the crank arm,-

and an adjustable connection between the crank arm and the drive for therotating shear drums for varying and the speeds of reciprocation of therotating shear drums with the strip material for various length cuts.

4. A rotary oscillating shear adapted to cut moving strip material intolengths, comprising a reciprocating shear frame, a pair of cooperatinglrotary shear drums each having abutting blade thereon mounted in theshear frame, means for rotating the shear drums, a rotating crank armfor reciprocating the shear frame, an adjustable connection between therotating crankvarm 'and the shear frame, and means for rotating the Ycrank arm the same speed as the shear drums. 5. A rotary oscillatingshear adapted to'cut moving strip material into lengths, comprising areciprocating shear fra e, a pair of cooperating rotary shear drums eachhaving a cutting blade thereon mounted in the shear frame, means forrotating the shear drums, a crank arm 'rotated 'through the drive forthe shear drums, a connection between the crank arm and thereciproeating shear frame, and means in the connection adapted to rotatethe crank arm the same speed as the sheardrums during the reciprocationof the shear frame.

6. A rotary oscillating shear adapted to cutV moving, strip materialinto lengths, comprising a reciprocating shear frame, a pair ofcooperating rotary shear drums each having a cutting blade thereonmounted in the shear frame, means for rotating the shear drums, a crankarm mounted 404 adjacent to the shear frame and rotated -by the drivefor the shear drums for reciprocating the shear frame, and an adjustableconnection between the crank arm and the shear frame for varying thespeed of the reciprocating shear frame and the rotary shear drums tosynchronize their speed with the speed of the strip for various lengthcuts.

'1.A rotary oscillating shear adapted to cut moving strip material intolengths, comprising a reciprocating shear frame, a pair of cooperatingrotary shear drums having cutting blades thereon arm having a linkconnection with the crank.

arm, an oscillating arm mounted for swinging movement, a pitmanconnection between shear frame and the oscillating arm, a connecting rodbetween the rocker arm and-the oscillating arm, and means for adjustingthe connecting rod for adjusting the reciprocating shear frame andtherotary shear drums to synchronize their. speed with the strip materialfor various length cuts.

8..A rotary oscillating'shear adapted to reclprocate relative to amoving strip material to shear the material vinto lengths, comprising areciprocating shear frame, a pair of cooperating rotary shear drums eachhaving a cutting blade thereon mounted in the shear frame, driving meansfor rotating the shear drums, a crank' arm mounted'adicent to the shear'frame rotated throughthe drive fcr the rotary. shear drums forreciprocating the shear frame, a connection between the crank arm andthe shear frame, and adjusting means in the connection for varyingtinuously' moving strip material into lengths, up`

rotary shear drums each l and the shear frame having the speed of thereciprocating shear frame to synchronize the speed with the stripmaterial 'with the rotary shear drums for various length 9 A rotaryoscillating shear adapted to cut moving strip material into lengths,comprisinga reciprocating shear frame, a pair of cooperating rotaryshear drums each having a cutting blade thereon mounted-in the shearframe, a crank arm mounted adjacent to the shear frame fro.

' i ld andthe shear frame, a screw threaded shaft journaled in theoscillating arm, a nut on said screw threaded shaft, a rod connectingthe rocker arm and oscillating arm having its ends pivoted to the nutson the screw threaded shafts, and means for rotating the screw threadedshafts to adjust the nuts and rod connection to vary the speed of thereciprocating shear frame and the rotary shear drums to synchronizetheir speedl with the strip material for various length cuts during thecutting operation.

13.,A rotary oscillating shear adapted to cut moving strip material intolengths, comprising a reciprocating shear frame, a pair of .cooperatingrocating shear frame and the rotary shear drums to synchronize the speedfor various length cuts.

10. A rotary oscillating shear adapted to cut moving strip material intolengths, comprising, a reciprocating shear frame, a pair of cooperatingwith the strip material rotary shear drums each having a cutting bladethereon mounted in the'shear frame, a crank arm mounted adjacent to theshear frame rotated through the drive for the shear drums, a swingingrocker arm between the shear frame and the crank arm, la pivoted linkconnection between the crank arm and the swinging rocker arm, a threadedshaft journaled in the swinging rocker arm, a. nut on the threadedshaft, a rod having one end pivoted to the nut and its opposite end witha connection pivoted to the shear trame, and means for rotating thethreaded shaft journaled in the swinging arm for adjusting the nut forVarying the speed of the reciprocating shear frame and the rotatingshear drums to synchronize the speed with the strip material for variouslength cuts.

l1. A rotary oscillating shear adapted to cut moving strip material intolengths, comprising a reciprocating shear frame, a pair of cooperatinghaving a cutting blade thereon mounted in the shear frame, a crank armmounted adjacent to the shear frame rotated through the drive for theshear drums, a pair of arms mounted for swinging movement and in spacedrelation between the crank arm and the .reciprocating shear frame, alink connecting one oi' the swinging arms with .the crank arm, a pitmanconnecting the other swinging arm with the shear frame, a connecting rodbetween the swinging arms, and means for adjusting the connecting rodbetween the swinging arms' to vary the speed of the reciprocating shearframe and the rotary drums to synchronize their speed rotary shear drumseach having a cutting blade thereon mounted in the shear frame, a crankarm mounted adjacent to the shear frame rotated through .the drive forthe shear drums, a connection between .the crank arm and the shearframe, and means for adjusting the .connection between the crank arm andthe shear frame .to vary the speed of the reciprocating shear frame andthe rotating shear drums to synchronize their speed with the stripmaterial for various length cuts duringithe cutting operation.

14. A rotary oscillating shear adapted to cut moving strip material intolengths, comprising a l reciprocating shear frame, a pair of cooperatingrotary shear drums each having a cutting blade thereon mounted in theshear frame, a crank arm mounted adjacent to the shear frame vn )tatedthrough the drive forthe shear drums, a rcker arm mounted for swingingmovemenha link con# nection between the rocker arm and the crank armhaving its ends pivotally attached thereto,

Ian oscillating arm mounted for swinging movement, a pitman connectingthe oscillating arm with the reciprocating shear frame having its endspivotally attached thereto, a connectingmrod having its ends pivotallyattached to the oscillating and rocker arms,v and means for adjustingthe connecting rod between the oscillating and rocker arms to vary thespeed of the rerotary shear drums with the strip material for variouslength cuts screw threaded shaft, an oscillating arm mounted forswinging movement between the rocker arm trunnion extensions,

pitmans having their ends pivotally attached to the trunnion extensionsof the oscillating arm ciprocting shear frame and the rotary shear drumsto synchronize their speed .with the strip material for various lengthcuts during the cutting operation.

each having a cutting blade thereon mounted on arm mounted adjacent tothe shear frame rotated through the drive for the shear drums, a rockerarm mounted for swingingY movement having a pivoted link connection to.the crank arm, a screw threaded shaft journaled in .the rocker arm, anut on the screw threaded shaft, an adjustable conf nection between.Athe nut and the shear frame and pivotally attached thereto, and meansfor rotating the screw .threaded shaft to adjust the nut and connectionto the shear frame for varying the speed of the reciprocating shearframe and the `rotary shear drums to synchronize .their speed with thestrip material for various length cuts during the cutting operation.

16. A rotary oscillating shear adapted to cut moving strip material intolengths, comprising a reciprocating shear frame, a .pair of cooperatingrotary shear drums each having a cutting blade thereon mounted in theshear frame, crank arms mounted adjacent to the 'shear frame rotatedthrough the drive for the shear drums, a rocker arm mounted for swingingmovement having trunnion gxtensions, link connections having their Itheshear frame, a crank v ends pivotally attached to thetrunnion'extensions and the crank arms, a screw threaded shaft journaledin the rocker threaded shaft, an oscillating arm mounted for swingingmovement between the rocker, arm and the shear frame having trunnionextensions,.pit

mans having their ends pivotally attached to the material for variouslength cuts during the cutting operation. y A

17. A rotary oscillating shear adapted to cut moving strip material intolengths, comprising a pair of reciprocating shear frames, a pairofcooperating rotary shear drums mounted in each reciprocating shearframe, a cutting blade on each-shear drum, a crank arm mounted adjacentto the shear frames adapted to be driven the same speed as the sheardrums -to reciprocate the shear frames; a rocker arm mounted forswinging movement between the crank arm and the reciprocating shearframe, a pitman having its ends pivoted to the crank arm Iand the rockerarm, a

screw threaded shaft iournaled in the rocker arm,-

a nut onthe screw threaded shaft, 4a connecting rod having one endpivoted to the nut and .the

opposite end pivotally connected to one of the reciprocating shearframes, and means forrotating the' screw threaded shaft to adjust .thenut and end of the connecting rod for varying the speed of thereciprocating shear frame and the knife speeds for the rotaryshear drumsto synchronize the speed of the shear drums with the speed of the stripfor various length cuts. y

18. A rotary oscillating shear adapted to cut moving strip material intolengths, comprising a pair vof. coacting reciprocating shear frames,means for adjusting the shear frames in spaced relation to each other, apair of cooperating rotary shear drums mounted in each reciprocatingshear frame, a cutting blade on each shear drum, the cutting'blades inone pair of shear drums adapted to be mounted in one shear frameapproximately 5 aheadl of the shear blades in the shear drums in theadjacent shear frame, a, crank arm mounted adjacent to the .shear framesadapted to be driven the same speed as the shear drums to reciprocatethe shear frames, a rocker arm mounted for swinging movement between thecrank arm and the reciprocating shear frame, a pitman having its endspivoted to the crank arm and rocker arm, a screw threaded shaftjournaled in the rocker arm, a nutson the screw threaded shaft,aconnecting rod having one end pivoted to the nut and the opposite endpivotally connected to one of the reciprocating shear frames, c andmeans for rotating the screw threaded shaft to adjust the n ut and endof the connecting rod for varying the speed of the reciprocating shearframe and the knife speeds for the rotary shear drums to synchronize.the "speed of the Vshear drums with the speed of the strip for variouslength cuts.

A19. A rotary oscillatingshear adapted to cut moving strip material intolengths, comprising a reciprocating shear frame, a pair of cooperatingrotary shear drums each having a cutting blade arm, a nut on the screw12 thereon mounted in. the shear frame, means for rotating the sheardrums, a crank arm mounted on the shear frame and movable therewith,means' driven by one of the shear drums for rotating thecrank arm, a rodhaving one end pivoted to a fixed anchor and the opposite end pivoted tothe rotating crank arm, and means for adjusting the relationof the crankarm tou the shear blades to synchronize the speed of the reciprocatingshear frame and the shear drums with'the speed of the strip for variouslength cuts. 20. A rotary oscillating shear adapted to cut moving stripmaterial into lengths, comprising a reciprocating shear frame, a pair ofcooperating rotary/shear drums, each having a cutting blade thereonmounted .in the shear frame, means for s rotating the shear drums, a.gear keyed to the end of' the shaft of one of shear drums, a crank shaftjournaled inbearings on the shear frame, a gear of the same diameter asthat on the drum shaft secured to the crank shaft and meshing with anddriven by the gear on the drum shaft, a worm c wheel on the crank shaftadapted to rotate on the crank shaft, a crank keyed to the worm wheel,bearings extending from the gear on the crank shaft, a worm meshing withthe worm Wheel having'its shaft journaled in the bearings, a rod .hav-

ing one end pivoted to a fixed anchor and the opposite end pivoted tothe rotating crank arm, a`

scale on the gear on the crank shaft for indicating the cut desired, andmeans for rotating the worm `to rotate the worm wheel and crank inrelation to I the gear on the crank shaft.

21. A rotary oscillating shear adapted to cut moving strip material intolengths, comprising a reciprocating shear frame, a pair of cooperatingrotary shear drums each having a cutting blade thereon mounted in theshear frame, means for rotating the shear drums, a crank arm mounted yfor rotation adjacent to the shear drums,means for rotating the crankarm through the drive for the shear drums to reciprocate the shearframe, and means for adjusting the angularity of the crank arm inrelation to the cutting blades for different length cuts.

22. A rotary oscillating shear adapted to cut moving strip, materialinto lengths, comprising a reciprocating shear frame, upper and lowercooperating rotary shear drums each having a cutting blade thereonmounted in the shear frame, means for rotating the shear drums, a crankshaft journaled in bearings on the shear frame, a crank arm mounted onthe crank shaft, a rod having one end pivoted to a fixed anchor and theopposite end '55. pivoted to the crank arm, means for rotating the crankarm the same number of revolutionsas the lower shear drum, and means foradjusting the angularity of the crank arm in relation to the shearbladesfor various length cuts. 4 23. .A rotary oscillating shear adaptedto cut moving strip material into lengths, comprising a reciprocatingshear frame, upper and lower cooperating rotary shear drums each havinga, cutting blade thereon mounted in the shear frame, means for rotatingthe shear drums, a crank shaft journaled in bearings on the shear frame,a crank arm mounted on the crank shaft, a gear secured to the iowershear drum meshing with a gear of the same diameter keyed to the crankshaft, a scale on the gear keyed to the crank shaft, a worm wheelprovided with a pointer mounted for rota,- tion with the crank arm onthe crank shaft, a rod having one end pivoted to a fixed anchor and theopposite end pivoted to the' crank arm, and means .75 for adjusting thecrank arm and worm wheel s0 the pointer will register with the scale onthe gear wheel mounted on the crank shaft for the length of cut desired.Y

24. A rotary oscillating shear adapted to cut moving strip material'into lengths, comprising a reciprocating vshear frame, upper and lowercooperating rotary shear drums each having a cutting .blade thereonmounted in the shear frame, means for rotating the shear drums, a, crankshaft journaled in bearings on the shear frame, a crank arm mounted onthe crank shaft, a gear secured to the lower shear drum meshing with agear of the same diameter keyed to the :crank shaft, a scale on the gear,keyed to the crank shaft, a worm wheel provided withna pointer mountedfor rotation with thescrank arm on the crank shaft, `a rod having oneend pivoted to a xed anchor and the opposite end pivoted to the crankarm, journal bearings extending from the side of the gear mounted on thecrank shaft, a' worm meshing with the worm wheel having its shaftjournaled in the bearings extending from the side ofthe gear mounted onthe crank shaft, and means for rotating the wormyfor adjusting the crankarm and worm wheel so the pointer will register with the scale onVthevgear wheel mounted on the crank shaft for the length of cutdesired.

RICHARD H. STEVENS.

